add DjangoUnionType test

graphene_django/tests/test_types.py

@@ -11,9 +11,15 @@ from graphene.relay import Node
 
 from .. import registry
 from ..filter import DjangoFilterConnectionField
-from ..types import DjangoObjectType, DjangoObjectTypeOptions
+from ..types import (
+    DjangoObjectType,
+    DjangoObjectTypeOptions,
+    DjangoUnionType,
+)
 from .models import (
+    APNewsReporter as APNewsReporterModel,
     Article as ArticleModel,
+    CNNReporter as CNNReporterModel,
     Reporter as ReporterModel,
 )
 
@@ -799,3 +805,47 @@ def test_django_objecttype_name_connection_propagation():
     assert "type Reporter implements Node {" not in schema
     assert "type ReporterConnection {" not in schema
     assert "type ReporterEdge {" not in schema
+
+
+@with_local_registry
+def test_django_uniontype_name_connection_propagation():
+    class CNNReporter(DjangoObjectType):
+        class Meta:
+            model = CNNReporterModel
+            name = "CNNReporter"
+            fields = "__all__"
+            filter_fields = ["email"]
+            interfaces = (Node,)
+
+    class APNewsReporter(DjangoObjectType):
+        class Meta:
+            model = APNewsReporterModel
+            name = "APNewsReporter"
+            fields = "__all__"
+            filter_fields = ["email"]
+            interfaces = (Node,)
+
+    class ReporterUnion(DjangoUnionType):
+        class Meta:
+            model = ReporterModel
+            types = (CNNReporter, APNewsReporter)
+            interfaces = (Node,)
+            filter_fields = ("id", "first_name", "last_name")
+
+        @classmethod
+        def resolve_type(cls, instance, info):
+            if isinstance(instance, CNNReporterModel):
+                return CNNReporter
+            elif isinstance(instance, APNewsReporterModel):
+                return APNewsReporter
+            return None
+
+    class Query(ObjectType):
+        reporter = Node.Field(ReporterUnion)
+        reporters = DjangoFilterConnectionField(ReporterUnion)
+
+    schema = str(Schema(query=Query))
+
+    assert "union ReporterUnion = CNNReporter | APNewsReporter" in schema
+    assert "CNNReporter implements Node" in schema
+    assert "ReporterUnionConnection" in schema